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[cdrw performance] hdparm -t
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raaf
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Joined: 31 Dec 2003
Posts: 293
Location: Kraków

PostPosted: Mon Dec 26, 2005 12:03 am    Post subject: [cdrw performance] hdparm -t Reply with quote

hi!

Code:
hdparm -t /dev/cdrw

/dev/cdrw:
 Timing buffered disk reads:    4 MB in  4.92 seconds = 831.84 kB/sec


what do u think about that? is it slow or not? is it correct or no? i dont have right now my another computer no comapre but i was worry that copying sth from cd to hd was taking so long ... so how about yours ibooks?

and ..
Code:

 hdparm -iv /dev/cdrw

/dev/cdrw:
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 HDIO_GETGEO failed: Invalid argument

 Model=MATSHITACD-RW CW-8124, FwRev=DB0D, SerialNo=
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2
 UDMA modes: udma0 udma1 udma2
 AdvancedPM=no
 Drive conforms to: device does not report version:

 * signifies the current active mode



regards
raaf
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agent_jdh
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Joined: 08 Aug 2002
Posts: 1779
Location: Scotland

PostPosted: Mon Dec 26, 2005 2:11 am    Post subject: Reply with quote

I'm not a PPC user but from your hdparm output it looks like your cdrw it using mdma (multiword dma) mode ... it might be worth trying to force it to use udma mode 2 ... check out man hdparm for the command, iirc it's -X 69 for mode 2. It looks like your drive supports that mode, so if your mobo does too, it may help.
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